Auric compounds from cantharidylethylenediamin and process of making same.



UNITED STATES PATENT OFFICE.

GUSTAV SPIESS, OF FRANKEORT-ON-THE-MAIN, AND ADOLF FELD'I, 0F OBER-URSEL,

GERMANY, ASSIGNORS TO FARCBWERKE VORM. MEISTER LUCIUS & BRUNING, 0F HOCHST-ON-THE-MAIN, GERMANY, A CORPORATION OF AURIC COMPOUNDS FROM' CANTHARIDYLETHYLENEDIAMIN AND PROCESS OF MAKING SAME.

N 0 Drawing.

Specification of Letters Patent.

Application filed July 28, 1913. Serial N 0. 781,642.

4 many, and Oberursel a. T., Germany, respectively, have invented certain new and useful Improvements in Auric Compounds from Cantharidylethylenediamin and Processes of Making Same, of which the following is a specification.

It is known that cantharidin possesses a particular afiinity to tuberculous foci. However as the cantharidin constitutes an exceedingly strong poison when introduced into the human body while it has apparently no strong bactericidal action, it couldhitherto not be used as a therapeutic.

Now we have found that, when using the cantharidin as starting material, highly efiicacious products suitable for being used as a remedy for tuberculosis are obtained by first rendering the cantharidin less poisonous by condensation with ethylenediamin and then causing a complex auric acid, particularly auric chlorid, auric cyanid, or auric rhodamid to act upon the product thus obtained. The products thus obtained correspend most probably to the general formula:

wherein X stands for a complex auric acid. They are colorless to golden-yellow crystals, which are soluble in water without decomposition, scarcely soluble in ether and benzene and decompose when heated, leaving metallic gold. The products have a very strong bactericidal action when introduced into the animal or human body.

The following examples illustrate our invention:

Example I: 1 gram of the hydrochlorid of the said cantharidin base O H O N is dissolved in 10 cc. of cold water and there is added drop by drop a. concentrated solution of auric chlorid until the precipitation ceases. The aurate at once separates in the form of golden-yellow crystalline laminae which melt at 218220 C.

Example II: 1 gram of the hydrochlorid of the cantharidin' base above referred to is dissolved in 5 cc. of cold water and there is then added a solution of 1.12 grams of po- Patented Jul 21, 1914..

tassium aurocyanid in 15 cc. of cold water.

After a short time, the auric cyanate separates in the form of large, colorless crystals, 'melting at 226227 C. The analysis of the substance showed a percentage of gold of 36.28, whereas according to theory it should be 36.48.

Example III: To 1 gram of the hydrochlorid of cantharidylethylenediamin, dissolved in 25cc. of water, is added a solution of 1 gram of pure potassium-aurorhodamid in 25 cc. of water. The salt which separates is immediately filtered off as decomposition sets in if it stands for a longer time. The said salt is moderately soluble in cold water. It crystallizes in the form of colorless laminae melting at 168-170 C. By analysis it is found to contain 36.2 per cent. of gold, whereas according to theory the percentage should be 35.69.

Example IV: 25 grams of .cantharidylethylenediamin hydrochlorid are dissolved in 100 cc. of water and there is then added a solution of 25 grams of potassium aurocyanid in 200 cc. of water. After a short time the aurate separates .in the form of beautiful colorless crystals. The cantharidylethylenediamin aurocyanid thus obtained melts at about 177179 C. It is readily soluble in water, scarcely soluble in ether and benzene. It probably contains the atomic group It decomposes when heated, leaving metallic i being colorless to golden-yellow crystals,

sists in causing a complex auric acid to act upon the 2. As new .products, auric compounds from cantharidylethylenediamin which most probably correspond to the genral formula:

cantharidin ethylcnediamin.

CHCOOH /a L\ wherein X stands for a complex auricucid,

soluble in water without decomposition,

scarcely s composin gold.

oluble in ether and benzene and deg, when heated, leaving metallic 3. As a new product, the cantharidylethylenediamin aurocyanid, having most probably the atomic group: 20

GUSTAV SPIESS. ADOLF FELDT.

Witnesses:

JEAN GRUND, CARL GRUND. 

